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Depending on the capture process, liquid or supercritical car-bon dioxide (CO2) can contain impurities like water (H2O) and sulfur dioxide (SO2), increasing the likelihood of corrosion of carbon steel pipelines even if there is no free water in the sys-tem. To understand the corrosion risk for such pipelines, the present study focused on the effects of CO2 phase change, water, and SO2. Different CO2 phases (liquid and supercritical) and concentrations of SO2 (<1%) were simulated in an auto-clave-based study. The corrosion rate of steel samples was determined with weight-loss (WL) measurements. The sur-face morphology and the composition of the corrosion prod-uct layers were analyzed using surface analytical techniques (scanning electron microscopy [SEM], energy-dispersive spec-troscopy [EDS], and infinite focus microscopy [IFM]). Result